#include <bits/stdc++.h>
using namespace std ;
const int MAX = 2e6 + 10 ;
int arr[MAX] ;
int n ;
string s ;
bool check(string s2 , int l , int r)
{
int idx = 0 ;
int rem = 1 ;
for(int i = l ; i <= r && idx < s2.size() ; ++i)
{
if(s[i] == s2[idx])
++idx ;
else
rem-- ;
}
return (idx == s2.size() && rem >= 0) ;
}
int main()
{
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
cin>>n ;
cin>>s ;
if(n%2 == 0)
return cout<<"NOT POSSIBLE\n" , 0 ;
bool flag1 = check(s.substr(0 , n/2) , n/2 , n-1) ;
bool flag2 = check(s.substr(n-n/2 , n/2) , 0 , n/2) ;
if(!flag1 && !flag2)
cout<<"NOT POSSIBLE\n" ;
else if(flag1 && flag2 && s.substr(0 , n/2) != s.substr(n-n/2 , n/2))
cout<<"NOT UNIQUE\n" ;
else if(flag1)
cout<<s.substr(0 , n/2)<<"\n" ;
else
cout<<s.substr(n-n/2 , n/2) ;
return 0 ;
}
Compilation message
friends.cpp: In function 'bool check(std::string, int, int)':
friends.cpp:16:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | for(int i = l ; i <= r && idx < s2.size() ; ++i)
| ~~~~^~~~~~~~~~~
friends.cpp:23:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
23 | return (idx == s2.size() && rem >= 0) ;
| ~~~~^~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Correct |
0 ms |
204 KB |
Output is correct |
| 3 |
Correct |
0 ms |
204 KB |
Output is correct |
| 4 |
Correct |
0 ms |
204 KB |
Output is correct |
| 5 |
Correct |
0 ms |
204 KB |
Output is correct |
| 6 |
Correct |
0 ms |
204 KB |
Output is correct |
| 7 |
Correct |
0 ms |
204 KB |
Output is correct |
| 8 |
Correct |
0 ms |
204 KB |
Output is correct |
| 9 |
Correct |
0 ms |
204 KB |
Output is correct |
| 10 |
Correct |
0 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| 12 |
Correct |
0 ms |
204 KB |
Output is correct |
| 13 |
Correct |
0 ms |
204 KB |
Output is correct |
| 14 |
Correct |
1 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
0 ms |
204 KB |
Output is correct |
| 17 |
Correct |
0 ms |
204 KB |
Output is correct |
| 18 |
Correct |
0 ms |
204 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
0 ms |
204 KB |
Output is correct |
| 21 |
Correct |
0 ms |
204 KB |
Output is correct |
| 22 |
Correct |
0 ms |
204 KB |
Output is correct |
| 23 |
Correct |
0 ms |
204 KB |
Output is correct |
| 24 |
Correct |
0 ms |
204 KB |
Output is correct |
| 25 |
Correct |
0 ms |
204 KB |
Output is correct |
| 26 |
Correct |
1 ms |
204 KB |
Output is correct |
| 27 |
Correct |
0 ms |
316 KB |
Output is correct |
| 28 |
Correct |
0 ms |
204 KB |
Output is correct |
| 29 |
Correct |
0 ms |
204 KB |
Output is correct |
| 30 |
Correct |
0 ms |
204 KB |
Output is correct |
| 31 |
Correct |
0 ms |
316 KB |
Output is correct |
| 32 |
Correct |
0 ms |
204 KB |
Output is correct |
| 33 |
Correct |
0 ms |
204 KB |
Output is correct |
| 34 |
Correct |
0 ms |
204 KB |
Output is correct |
| 35 |
Correct |
0 ms |
204 KB |
Output is correct |
| 36 |
Correct |
1 ms |
320 KB |
Output is correct |
| 37 |
Correct |
1 ms |
324 KB |
Output is correct |
| 38 |
Correct |
1 ms |
204 KB |
Output is correct |
| 39 |
Correct |
0 ms |
204 KB |
Output is correct |
| 40 |
Correct |
0 ms |
204 KB |
Output is correct |
| 41 |
Correct |
0 ms |
204 KB |
Output is correct |
| 42 |
Correct |
1 ms |
204 KB |
Output is correct |
| 43 |
Correct |
1 ms |
204 KB |
Output is correct |
| 44 |
Correct |
0 ms |
204 KB |
Output is correct |
| 45 |
Correct |
0 ms |
320 KB |
Output is correct |
| 46 |
Correct |
0 ms |
204 KB |
Output is correct |
| 47 |
Correct |
0 ms |
204 KB |
Output is correct |
| 48 |
Correct |
0 ms |
204 KB |
Output is correct |
| 49 |
Correct |
0 ms |
204 KB |
Output is correct |
| 50 |
Correct |
0 ms |
204 KB |
Output is correct |
| 51 |
Correct |
1 ms |
324 KB |
Output is correct |
| 52 |
Correct |
0 ms |
204 KB |
Output is correct |
| 53 |
Correct |
1 ms |
320 KB |
Output is correct |
| 54 |
Correct |
1 ms |
204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
4184 KB |
Output is correct |
| 2 |
Correct |
10 ms |
4208 KB |
Output is correct |
| 3 |
Correct |
8 ms |
4208 KB |
Output is correct |
| 4 |
Correct |
7 ms |
4208 KB |
Output is correct |
| 5 |
Correct |
7 ms |
4208 KB |
Output is correct |
| 6 |
Correct |
6 ms |
2408 KB |
Output is correct |
| 7 |
Correct |
8 ms |
6200 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5572 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5616 KB |
Output is correct |
| 10 |
Correct |
7 ms |
5544 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4368 KB |
Output is correct |
| 12 |
Correct |
0 ms |
320 KB |
Output is correct |
| 13 |
Correct |
1 ms |
204 KB |
Output is correct |
| 14 |
Correct |
0 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
0 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
204 KB |
Output is correct |
| 18 |
Correct |
0 ms |
204 KB |
Output is correct |
| 19 |
Correct |
0 ms |
204 KB |
Output is correct |
| 20 |
Correct |
0 ms |
316 KB |
Output is correct |
| 21 |
Correct |
0 ms |
204 KB |
Output is correct |
| 22 |
Correct |
1 ms |
204 KB |
Output is correct |
| 23 |
Correct |
0 ms |
204 KB |
Output is correct |
| 24 |
Correct |
0 ms |
204 KB |
Output is correct |
| 25 |
Correct |
0 ms |
204 KB |
Output is correct |
| 26 |
Correct |
0 ms |
232 KB |
Output is correct |
| 27 |
Correct |
1 ms |
204 KB |
Output is correct |
| 28 |
Correct |
1 ms |
204 KB |
Output is correct |
| 29 |
Correct |
1 ms |
204 KB |
Output is correct |
| 30 |
Correct |
0 ms |
204 KB |
Output is correct |
| 31 |
Correct |
0 ms |
204 KB |
Output is correct |
| 32 |
Correct |
0 ms |
204 KB |
Output is correct |
| 33 |
Correct |
0 ms |
204 KB |
Output is correct |
| 34 |
Correct |
0 ms |
324 KB |
Output is correct |
| 35 |
Correct |
0 ms |
204 KB |
Output is correct |
| 36 |
Correct |
0 ms |
204 KB |
Output is correct |
| 37 |
Correct |
1 ms |
296 KB |
Output is correct |
| 38 |
Correct |
0 ms |
320 KB |
Output is correct |
| 39 |
Correct |
0 ms |
316 KB |
Output is correct |
| 40 |
Correct |
1 ms |
204 KB |
Output is correct |
| 41 |
Correct |
0 ms |
204 KB |
Output is correct |
| 42 |
Correct |
1 ms |
320 KB |
Output is correct |
| 43 |
Correct |
0 ms |
204 KB |
Output is correct |
| 44 |
Correct |
1 ms |
204 KB |
Output is correct |
| 45 |
Correct |
1 ms |
204 KB |
Output is correct |
| 46 |
Correct |
0 ms |
204 KB |
Output is correct |
| 47 |
Correct |
0 ms |
204 KB |
Output is correct |
| 48 |
Correct |
1 ms |
316 KB |
Output is correct |
| 49 |
Correct |
0 ms |
320 KB |
Output is correct |
| 50 |
Correct |
0 ms |
204 KB |
Output is correct |
| 51 |
Correct |
0 ms |
204 KB |
Output is correct |
| 52 |
Correct |
1 ms |
204 KB |
Output is correct |
| 53 |
Correct |
0 ms |
204 KB |
Output is correct |
| 54 |
Correct |
0 ms |
204 KB |
Output is correct |
